DAVE'S - YAMAHA FZR250
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Bike Video
Not the best quality due to tech
problems. 5min 11.2Mb
North
West Car Club of Tasmania
This is hard to find on search engines
NWCC Tasmania
1989 model 2KR with EXUP
This bike is 250cc and fitted with what YAMAHA calls EXUP (EXhaust Ultimate Power).
It consists
of a servo
motor driven valve which is fitted in the exhaust system where the four
pipes
join into one under the gearbox.
What this does is to close off at low revs to increase the low exhaust
back
pressure caused by the wild valve timing.
This pressure actually pushes back into cylinders when the exhaust
valves first
open, increasing downward force on the
pistons, increasing torque at the back wheel at low revs.
The valve progressively starts opening from 3000 rpm to fully open at
8000rpm.
The engine therefore performs
usefully between 3000 to 17000rpm.
SPECS
Engine - 250cc 4 cylinder DOHC 16 valve water-cooled
Power - 45hp at 16000rpm
Torque - 2.5kgfm at 12,000rpm
Full transistor type battery ignition by digital ignition system
Carbs - 4 downdraught MIKUNI BDST28
Frame - steel although during late'89 changed to aluminium
(3LN model)
Top speed - 175-180kph
Acceleration - 0-100kph reportedly 5.5seconds
1/4 mile reportedly 14.5 sec
Lean angle - 52deg.
Fairings and tank cover removed for service Air box minus the filter
Slight rust on
frame near
battery before being cleaned off and re-painted
Recommended tyre sizes
EXUP BOX under
frame
Air filter